Yash told himself in the bathroom that Aartiji can never be wrong. This shows that his "love" for her is at the infatuation stage, because he doesn't think she has flaws. He thinks she's perfect. Isn't that what he thought about Arpita? Perfect. No flaws? I think that he'll truly be in love with her once the truth is out, because then he'll realize that she is a normal human being and she isn't perfect.
It's the same with Aarti. She thought he couldn't ever be wrong until the hulk Yash came along. Despite his flaws during that time period, she continued to love him, which makes her love pure. Before Yash's hulk phase, her love was merely infatuation as well.